US6390077B1 - Adaptive flow restriction test method for an exhaust gas recirculation system - Google Patents
Adaptive flow restriction test method for an exhaust gas recirculation system Download PDFInfo
- Publication number
- US6390077B1 US6390077B1 US09/816,938 US81693800A US6390077B1 US 6390077 B1 US6390077 B1 US 6390077B1 US 81693800 A US81693800 A US 81693800A US 6390077 B1 US6390077 B1 US 6390077B1
- Authority
- US
- United States
- Prior art keywords
- opening
- test
- egr system
- egr
- threshold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
Definitions
- the present invention relates to vehicle diagnostic systems, and more particularly to a method of testing for flow restrictions in an engine exhaust gas recirculation system.
- Vehicle exhaust gas emissions are commonly reduced with an exhaust gas recirculation (EGR) valve controlled to allow engine exhaust gas to flow back into the intake air stream of the engine.
- EGR exhaust gas recirculation
- the recirculated exhaust gas reduces peak temperatures within the combustion chamber, which in turn, reduces the formation of oxides of nitrogen (NOX).
- NOX oxides of nitrogen
- various exhaust gas passages in the EGR system may become restricted due to physical damage or formation of deposits (coking), allowing the peak combustion temperatures and NOX emissions to increase.
- the engine controller is programmed to periodically run a diagnostic procedure that tests for flow restrictions and produces a fault indication if a debilitating restriction is detected.
- the procedure involves forcing the EGR valve to a predetermined opening when it would otherwise be closed, and measuring the resulting change in intake manifold absolute pressure.
- the EGR system is deemed to pass the test if the measured change in pressure exceeds a threshold based on the minimum expected change in intake manifold pressure for an EGR system that is regarded as functioning within acceptable limits, but is deemed to fail the test if the measured pressure change is below the threshold.
- the present invention is directed to an improved test method for detecting EGR system restrictions which can reliably detect a debilitating restriction without significantly degrading combustion stability and exhaust emissions.
- the EGR valve opening for diagnostic purposes (referred to herein as the test opening) is initialized at a relatively low value, which is progressively increased if the measured intake manifold pressure change fails to exceed a threshold based on the minimum expected change in intake manifold pressure for an EGR system which is regarded as functioning within acceptable limits.
- the test method is terminated. If the EGR valve opening reaches a maximum value without the measured pressure exceeding the threshold, the EGR system is deemed to fail the restriction test, and a fault indication is generated.
- the value at which the test opening is initialized is determined based on the results of a prior execution of the flow restriction test so as to minimize the duration of the test and its impact on engine operation.
- the test opening of the EGR valve is adaptively determined based on the measured intake manifold pressure change, and is never larger than required to reliably detect a debilitating EGR restriction.
- the test opening remains relatively small if the EGR system is substantially unrestricted, but is capable of achieving a very large value if the EGR system is significantly restricted. This, in turn, allows reliable detection of a borderline failing EGR system with less test result variability, while preventing degradation of combustion stability and emissions in a substantially unrestricted EGR system.
- FIG. 1 is a schematic diagram of a vehicle EGR system, including a microprocessor-based engine controller.
- FIG. 2 is a flowchart representative of instructions executed by the controller of FIG. I in carrying out the test method of the present invention.
- the reference numeral 10 generally designates a motor vehicle power plant, wherein an intake air stream 12 enters an intake manifold 14 and is combusted with a suitable quantity of fuel in engine 16 , and wherein the combustion exhaust gases 20 exit through an exhaust manifold 18 .
- An EGR system including EGR valve 22 and associated connective tubing 24 connects the exhaust manifold 18 to the intake manifold 14 , allowing exhaust gases in exhaust manifold 18 to flow into the intake manifold 14 .
- the EGR valve 22 may be fully closed so that there will be no exhaust gas flow through tubing 24 , or it may be either partially or fully open so that there will be some amount of exhaust gas recirculated into and mixed with the intake air stream 12 .
- a microprocessor-based controller 25 regulates the opening of EGR valve 22 in accordance with a predefined schedule for reducing exhaust gas emissions, as explained above.
- a pressure sensor 26 senses the absolute pressure in intake manifold 14 , and provides a corresponding signal (MAP) to controller 25 to aid in diagnosing the proper operation of the EGR valve 22 and associated connective tubing 24 .
- MAP corresponding signal
- a diagnostic EGR flow test is performed under conditions during which the EGR valve 22 is normally closed, such as during vehicle deceleration.
- the purpose of the EGR flow test is to detect the presence of a restriction in the EGR valve 22 and/or associated connective tubing 24 that impedes the scheduled flow of exhaust gas to the intake manifold 14 . Since EGR flow increases the pressure in intake manifold 14 , a given change in EGR flow produces a corresponding change in the MAP signal generated by pressure sensor 26 .
- the flow test is initiated with EGR valve 22 in the normal fully closed position, and a corresponding initial MAP signal value is recorded.
- the controller 25 then commands the EGR valve 22 to test opening, records a corresponding final MAP signal value, and computes the pressure change according to the difference between the initial and final MAP signal values.
- the pressure change is then compared to a threshold based on the minimum expected change in intake manifold pressure for an EGR system that is regarded as functioning within acceptable limits. If the measured pressure change is greater than or equal to the threshold, the EGR system passes the diagnostic test. If the measured pressure change is less than the threshold, the EGR system fails the diagnostic test.
- FIG. 2 is a flow diagram representative of program instructions executed by the controller 25 in carrying out the improved flow test method.
- the test is initiated at block 100 by recording the initial MAP signal value when the enabling conditions are met and the EGR valve 22 is fully closed.
- the controller 25 determines an initial test opening for EGR valve 22 .
- the initial test opening may be a predetermined fraction of the maximum valve opening that minimizes degradation of engine operation for an EGR system with substantially unrestricted flow, but in subsequent testing may be determined based on a test opening recorded during earlier flow restriction testing, as explained below.
- the controller 25 commands the EGR valve 22 to the test opening and records the final MAP signal value.
- the controller 25 compares the pressure change (that is, the difference between the recorded initial and final MAP signal values) to a threshold based upon the minimum expected pressure change for an EGR system that is regarded as functioning within acceptable limits.
- the block 140 is executed to record the current test opening, and to indicate that the EGR system passed, whereupon the flow test is terminated as indicated at block 180 .
- the test opening recorded at block 140 is used to initialize the test opening during the next execution of the flow restriction test; for example, the test opening may be initialized to a predetermined fraction of the recorded test opening. Initializing the test opening in this manner allows controller 25 to learn from prior testing for the purpose of minimizing the duration of test and its impact on engine operation.
- block 150 determines if the EGR valve opening has reaches a maximum possible opening. If not, then it is possible that the test could be passed by increasing the test opening; in this event, the block 170 is executed to increase the test opening, whereupon the foregoing blocks are re-executed to position the EGR valve 22 accordingly and re-compute the pressure change.
- block 150 determines that the EGR valve 22 has reached the maximum possible opening
- the EGR system is deemed to be restricted and the block 160 is executed to indicate that the EGR system failed the flow test, whereupon the flow test is terminated as indicated at block 180 .
- the adaptive selection of an EGR test opening in accordance with the present invention improves the detection reliability of a restricted EGR system while minimizing any degradation of combustion stability and exhaust emissions in a substantially un-restricted EGR system.
- the exhaust emissions and driveability are improved because the EGR valve 22 is only opened to the extent required to produce a given intake manifold pressure change, and the indicated useful life of the EGR system is extended because the test opening can be increased to the maximum possible amount in an acceptably restricted EGR system.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/816,938 US6390077B1 (en) | 1999-10-27 | 2000-09-13 | Adaptive flow restriction test method for an exhaust gas recirculation system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16184099P | 1999-10-27 | 1999-10-27 | |
US09/816,938 US6390077B1 (en) | 1999-10-27 | 2000-09-13 | Adaptive flow restriction test method for an exhaust gas recirculation system |
Publications (1)
Publication Number | Publication Date |
---|---|
US6390077B1 true US6390077B1 (en) | 2002-05-21 |
Family
ID=22582982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/816,938 Expired - Lifetime US6390077B1 (en) | 1999-10-27 | 2000-09-13 | Adaptive flow restriction test method for an exhaust gas recirculation system |
Country Status (3)
Country | Link |
---|---|
US (1) | US6390077B1 (en) |
EP (1) | EP1096130B1 (en) |
DE (1) | DE60001616T2 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020060620A1 (en) * | 2000-09-11 | 2002-05-23 | Bircann Raul A. | Proportionally-controllable solenoid actuator |
US20030106728A1 (en) * | 2001-12-12 | 2003-06-12 | Honda Giken Kogyo Kabushiki Kaisha | Method for detecting abnormality in hybrid vehicle |
US6802302B1 (en) * | 2003-04-08 | 2004-10-12 | Cummins, Inc. | System for diagnosing EGR flow rate operation |
US6871699B1 (en) | 1999-08-16 | 2005-03-29 | Delphi Technologies, Inc. | Engine coolant conduit with integral alternator and exhaust gas recirculation valve |
US20050199216A1 (en) * | 2004-03-12 | 2005-09-15 | Takuya Matsumoto | Failure diagnosis system for exhaust gas recirculation device |
US20090048765A1 (en) * | 2007-08-17 | 2009-02-19 | Gm Global Technology Operations, Inc. | Method and apparatus for monitoring an egr valve in an internal combustion engine |
US20120111000A1 (en) * | 2009-09-24 | 2012-05-10 | Toyota Jidosha Kabushiki Kaisha | Control apparatus of an internal combustion engine |
US20180283326A1 (en) * | 2017-03-30 | 2018-10-04 | Subaru Corporation | Egr malfunction detection system |
CN113063582A (en) * | 2021-03-26 | 2021-07-02 | 东风汽车集团股份有限公司 | EGR valve diagnostic method, device, equipment and readable storage medium |
US11339749B2 (en) * | 2019-02-19 | 2022-05-24 | Aisan Kogyo Kabushiki Kaisha | Engine EGR device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9147893B2 (en) * | 2004-06-02 | 2015-09-29 | Toyota Jidosha Kabushiki Kaisha | Failure diagnostic device for discharge valve |
FR2910126B1 (en) * | 2006-12-18 | 2009-01-23 | Renault Sas | AEROLIC TESTING BENCH FOR TESTING A COMPONENT |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5309887A (en) | 1992-08-07 | 1994-05-10 | Mitsubishi Denki Kabushiki Kaisha | Method of detecting abnormality in exhaust gas recirculation control system of internal combustion engine and apparatus for carrying out the same |
US5368005A (en) * | 1992-11-19 | 1994-11-29 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for detecting fault in exhaust gas recirculation control system of internal combustion engine |
JPH074320A (en) | 1993-06-17 | 1995-01-10 | Nippondenso Co Ltd | Exhaust gas recirculation control device |
US5508926A (en) * | 1994-06-24 | 1996-04-16 | General Motors Corporation | Exhaust gas recirculation diagnostic |
US5542400A (en) | 1994-09-30 | 1996-08-06 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Apparatus and method for determining a failure of an EGR apparatus |
US6024075A (en) * | 1998-06-29 | 2000-02-15 | Ford Global Technologies, Inc. | Engine control system with exhaust gas recirculation and method for determining proper functioning of the EGR system in an automotive engine |
-
2000
- 2000-09-13 US US09/816,938 patent/US6390077B1/en not_active Expired - Lifetime
- 2000-10-19 DE DE60001616T patent/DE60001616T2/en not_active Expired - Lifetime
- 2000-10-19 EP EP00203646A patent/EP1096130B1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5309887A (en) | 1992-08-07 | 1994-05-10 | Mitsubishi Denki Kabushiki Kaisha | Method of detecting abnormality in exhaust gas recirculation control system of internal combustion engine and apparatus for carrying out the same |
US5368005A (en) * | 1992-11-19 | 1994-11-29 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for detecting fault in exhaust gas recirculation control system of internal combustion engine |
JPH074320A (en) | 1993-06-17 | 1995-01-10 | Nippondenso Co Ltd | Exhaust gas recirculation control device |
US5508926A (en) * | 1994-06-24 | 1996-04-16 | General Motors Corporation | Exhaust gas recirculation diagnostic |
US5542400A (en) | 1994-09-30 | 1996-08-06 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Apparatus and method for determining a failure of an EGR apparatus |
US6024075A (en) * | 1998-06-29 | 2000-02-15 | Ford Global Technologies, Inc. | Engine control system with exhaust gas recirculation and method for determining proper functioning of the EGR system in an automotive engine |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6871699B1 (en) | 1999-08-16 | 2005-03-29 | Delphi Technologies, Inc. | Engine coolant conduit with integral alternator and exhaust gas recirculation valve |
US20020060620A1 (en) * | 2000-09-11 | 2002-05-23 | Bircann Raul A. | Proportionally-controllable solenoid actuator |
US6759934B2 (en) | 2000-09-11 | 2004-07-06 | Delphi Technologies, Inc. | Proportionally-controllable solenoid actuator |
US20030106728A1 (en) * | 2001-12-12 | 2003-06-12 | Honda Giken Kogyo Kabushiki Kaisha | Method for detecting abnormality in hybrid vehicle |
US7448459B2 (en) * | 2001-12-12 | 2008-11-11 | Honda Giken Kogyo Kabushiki Kaisha | Method for detecting abnormality in a hybrid vehicle |
US6802302B1 (en) * | 2003-04-08 | 2004-10-12 | Cummins, Inc. | System for diagnosing EGR flow rate operation |
US20050199216A1 (en) * | 2004-03-12 | 2005-09-15 | Takuya Matsumoto | Failure diagnosis system for exhaust gas recirculation device |
US7066160B2 (en) * | 2004-03-12 | 2006-06-27 | Toyota Jidosha Kabushiki Kaisha | Failure diagnosis system for exhaust gas recirculation device |
US20090048765A1 (en) * | 2007-08-17 | 2009-02-19 | Gm Global Technology Operations, Inc. | Method and apparatus for monitoring an egr valve in an internal combustion engine |
US7739027B2 (en) * | 2007-08-17 | 2010-06-15 | Gm Global Technology Operations, Inc. | Method and apparatus for monitoring an EGR valve in an internal combustion engine |
US20120111000A1 (en) * | 2009-09-24 | 2012-05-10 | Toyota Jidosha Kabushiki Kaisha | Control apparatus of an internal combustion engine |
US9010113B2 (en) * | 2009-09-24 | 2015-04-21 | Toyota Jidosha Kabushiki Kaisha | Control apparatus of an internal combustion engine |
US20180283326A1 (en) * | 2017-03-30 | 2018-10-04 | Subaru Corporation | Egr malfunction detection system |
US10865747B2 (en) * | 2017-03-30 | 2020-12-15 | Subaru Corporation | EGR malfunction detection system |
US11339749B2 (en) * | 2019-02-19 | 2022-05-24 | Aisan Kogyo Kabushiki Kaisha | Engine EGR device |
CN113063582A (en) * | 2021-03-26 | 2021-07-02 | 东风汽车集团股份有限公司 | EGR valve diagnostic method, device, equipment and readable storage medium |
CN113063582B (en) * | 2021-03-26 | 2023-11-03 | 东风汽车集团股份有限公司 | EGR valve diagnosis method, device, equipment and readable storage medium |
Also Published As
Publication number | Publication date |
---|---|
EP1096130A2 (en) | 2001-05-02 |
DE60001616T2 (en) | 2003-08-21 |
DE60001616D1 (en) | 2003-04-17 |
EP1096130A3 (en) | 2001-08-22 |
EP1096130B1 (en) | 2003-03-12 |
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